V-shaped Engine Balancer Shaft Vibration Reduction
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Solution Overview
Problem
Existing V-shaped engines do not effectively reduce vibration caused by the secondary inertia couple generated from lateral pressures on pistons, which is not addressed by current balancer mechanisms.
Innovation Solution
A V-shaped engine design incorporating a balancer mechanism with a balancer shaft that rotates opposite to the crankshaft at twice the speed, positioned parallel to the crankshaft, and a specific phase difference between crankpins to counteract the secondary inertia couple, utilizing a splay angle of 45° to 75° and a phase difference of 30° to 90° to minimize vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a secondary inertia couple reducing mechanism is added to address lateral pressure vibration, then vibration from secondary inertia couple is reduced, but device complexity increases
Solution Approach 1:
The patent merges the secondary inertia couple reducing mechanism with the existing balancer mechanism into a unified vibration reduction system. By integrating these functions into a coordinated system rather than separate independent mechanisms, the patent reduces overall device complexity while maintaining effective vibration reduction for both secondary inertia force and secondary inertia couple.
Solution Approach 2:
The balancer mechanism is designed with multi-functionality, serving both as a conventional balancer for secondary inertia force and as part of a coordinated system for reducing secondary inertia couple. This universal design approach allows a single integrated system to perform multiple vibration reduction functions, reducing the need for entirely separate mechanisms and thereby limiting the increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution significantly reduces vibration caused by the secondary inertia couple, achieving a balanced secondary inertia force and resulting in reduced engine vibration and improved operational stability.
Implementation Method 1
a secondary component of an inertia couple caused by lateral pressures from pistons
Implementation Method 2
The balancer shaft rotates in a direction opposite to that in which the crankshaft rotates. The balancer shaft rotates at a speed twice that at which the crankshaft rotates.
Data Source
AI summary
Vibration generated by a secondary inertia couple caused by lateral pressures from pistons of a V-shaped engine is reduced. A cylinder axis of a first cylinder and a cylinder axis of a second cylinder define a splay angle in a range of about 45° to about 75°. First and second crankpins have a phase difference in a circumferential direction of a shaft center of a crankshaft in a range of about 30° to about 90°. A balancer shaft included in a single-shaft balancer mechanism rotates in a direction opposite to that in which the crankshaft rotates at a speed twice that at which the crankshaft rotates. As viewed in an axial direction of the crankshaft, the balancer shaft is located on a side of a second reference line which is opposite to a side including first and second pistons, the second reference line being perpendicular or substantially perpendicular to a first reference line and passing through the shaft center of the crankshaft, the first reference line passing through the shaft center of the crankshaft and dividing the splay angle into two equal sub-angles.